Sash lock



May 25 19 26. 1,585,717

R. H. HUMMERT SASH LOCK Filed Dec. 4, 1924 INVEN TOR) GM I 3/ ATTORNEY.

Patented May 25, 1926.

UNITED STATES PATENT OFFICE.

ROBERT H. HUMMERT, OF DAYTON, QHIO,

ASSIGNOR TO THE S. H. THOMSON MANU- SASI-I Application filed December This invention relates to new and useful improvements in sash locks, and more particularly to looks for steel window sash.

It is the principal object of my invention 15 to provide for the cam sets of sash locks, 'a spring washer construction which reduces friction and takes up wear between the stationary and moving parts if wear occurs. In present types of sash locks, it is difiicult to maintain an equilibrium between the escutcheon and the cam arm, since, after short usage, the lock washer employed will grind a groove in the face of the escutcheon to cause the cam arm to wobble and rattle. In my construction, I obviate this difficulty by enforcing a yielding metal to metal contact between the cam arm and the escutcheon by means of a curl-spring washer.

In the accompanying drawings, Figure l is a perspective view of my sash lock applied to a steel window unit, which is shown partly in section. Figure 2 is a side view of the cam arm, with its inner end, the rivet, the escutcheon, the strike and the stationary and movable window members shown in section. Figure 3 is a plan view of the curled spring washer, Figure 4 is a cross sectional view taken through the same on the line 4-4 of Figure 3. And Figure 5 is a longtudinal, sectional view taken through the mushroomi head rivet.

Referring to the accompanying drawings for a detailed description of my invention, the numeral 1 designates a stationary, steel, window frame member to which there is secured, by screws 2, 2, the inner flat portion of a curved metal strike member 3. This member is formed with a flat portion which projects beyond the member 1, in parallelism with its longitudinal plane, and containing a longitudinal slot 4 adapted to receive the cam end of an arim 5 pivoted to an cscutcheon 6 secured to a movable steel sash member 7. (See Figures 1 and 2.)

The cam arm 5 is formed at its inner end witha widecam part 8 that curves partly around a central boss portion 9 containing a hole that receives the outer cylindrical part- 10 of a rivet or pin having a mushroom shaped head 11. (See Figure 2.) At its inner end the rivet terminates in a reduced LOCK.

4, 1924. Serial No. 753,788.

cylindrical portion 12 which is passed through a central hole in the escutcheon 6 and then flattened against its inner surface. Before the cam arm 5 is thus connected to the escutcheon 6, a curl-spring washer 13 is placed between the outer surface of the boss portion 9 of the cam arm and the mushroom head 11 of the rivet. The washer is then put under sufficient tension by the rivet when its inner end is flattened against the escutcheon, to enforce a yielding metal to metal contact between the inner part of the cam arm and the escutcheon. Such a contact reduces wear between these parts; and if slight wear does take place, the pressure which the curl-spring washer 13 exerts against the cam arm will maintain it in sufliciently tight engagement with the escntcheon at all times to prevent a wobbling movement of that arm.

The curl-spring washer not only insures a proper contact between the meeting surfaces of the cam arm and escutcheon, but holds that arm in any position to which it has been moved. It also permits a free movement of that arm to force its cam portion 8 into the slot 4 in the strike 3 in the well known operation of locking the movable sash 7 to the stationary window frame member 1. (See Figures 1 and 2.)

I do not wish to be limited to the curlspring washer 13 for enforcing a proper contact between the cam arm and the es cntcheon, since any other yielding means may be employed with the-rivet for that purpose if desired.

Having described my invention, 1 ole,

A device of thetype described, compr ing an escutcheon having central hole arm formed with a hole in its inner er l with a cam portion partly curved around said hole, a pin extending through the hole in the cam arm and escntcheon and flattened against the inner surface of the latter, said 95 pin having a mushroom head, and a curled spring washer mounted between the mushroom head of the pin and the outer surface of the cam arm, for the purpose specified.

In testimony whereof I have hereunto set my hand this 2d day of December, 1912- ROBERT H. HUMMERT. 

